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2. 2) World Steel Association, Steel Statistical Yearbook 2010, 2010, 3–5, 22–25.
3. 3) Tansokyokai, Tansokyokai 50 Nenno Ayumi, 1998, 69–75 [in Japanese].
4. 4) Tokai Carbon Co., Ltd., Brochure “Speciality Graphite”, 2010.
5. 5) iSuppli Corp., Press release September 2010, 2010.